A large sand-dwelling mayfly that runs over underwater sandbars like an underwater tiger beetle.

Species Range

Montana Range

Year-round

Range Comments

The eastern range limit of this species is North Dakota, Manitoba and Saskatchewan (Guenther and McCafferty, 2005) It is recorded for CO, MT, ND, NM, UT, WI, WY Canada AB, NT, SK . In MT it os found in the Milk River system near the canadian border, the Missouri River >100 miles down from Fort Peck and the Lower Yellowstone and Powder River systems.